diff --git a/exercises/ex07/ex07b.py b/exercises/ex07/ex07b.py
new file mode 100644
index 0000000..eb27349
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+++ b/exercises/ex07/ex07b.py
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+"""
+Project: Date Detection
+Page 186
+"""
+
+import re
+import datetime
+
+tests = """
+    Sí 1/1/1911
+    Sí 02/1/2000
+    Sí 12/12/2012
+    No 123/1/1911
+    No 1/123/1911
+    No 1/1/11
+    Inválido 32/12/1212
+    Inválido 3/13/1212
+    Inválido 3/12/3000
+    Inválido 3/12/00
+    Inválido 29/02/2023
+"""
+
+
+def find_date(string):
+    rgx = re.compile(r"\b(\d{1,2})/(\d{1,2})/(\d{4})")
+    finds = rgx.findall(string)
+    dates = []
+    for find in finds:
+        d, m, y = int(find[0]), int(find[1]), int(find[2])
+        if y > 999 and y < 3000:
+            try:
+                dates.append(datetime.date(y, m, d).isoformat())
+            except Exception:
+                pass
+    return dates
+
+
+dates = find_date(tests)
+print(dates)
diff --git a/exercises/ex07/ex07c.py b/exercises/ex07/ex07c.py
new file mode 100644
index 0000000..afc1045
--- /dev/null
+++ b/exercises/ex07/ex07c.py
@@ -0,0 +1,32 @@
+"""
+Project: Strong Password Detection
+Page 186
+"""
+
+import re
+
+tests = [
+    "",
+    "a",
+    "aaaaaaaa",
+    "AAAAAAAA",
+    "11111111",
+    "aAaAaAaA",
+    "a1a1a1a1",
+    "A1A1A1A1",
+    "aA1aA1aA1",
+]
+
+
+def check_pass(string):
+    withupper = True if re.match(r".*[A-Z]", string) else False
+    withlower = True if re.match(r".*[a-z]", string) else False
+    withdigit = True if re.match(r".*\d", string) else False
+    if len(string) >= 8 and withupper and withlower and withdigit:
+        print(f"'{string}' is a strong pass")
+    else:
+        print(f"'{string}' is NOT a strong pass")
+
+
+for test in tests:
+    check_pass(test)
diff --git a/exercises/ex07/ex07d.py b/exercises/ex07/ex07d.py
new file mode 100644
index 0000000..ae7f723
--- /dev/null
+++ b/exercises/ex07/ex07d.py
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+"""
+Project: Regex Version of the strip() Method
+Page 186
+"""
+
+import re
+
+tests = {
+    "Hola": None,
+    " Hola ": None,
+    "bHola": "b",
+    "\tHola,\tmundo\t": "\t",
+}
+
+
+def rgx_strip(string, char=" "):
+    string = re.sub(r"^" + char + r"+", "", string)
+    return re.sub(char + r"+$", "", string)
+
+
+for key, val in tests.items():
+    if val is None:
+        print(f"'{key}' -> '{rgx_strip(key)}'")
+    else:
+        print(f"'{key}' -> '{rgx_strip(key, val)}'")